I wanted my brother's first time to be mine. Ever since I was little, I couldn't help but think that my younger brother was so cute when he would run after me and say, Onee-chan! Onee-chan! She's a big sister who likes her younger brother so much that she gets jealous of her younger brother's favorite AV actress and even interrupts him masturbating many times. During the summer vacation of university, she had a fight with her boyfriend and had nothing to do, so when she returned home...